Hi Gain,
I am really sorry for the delay of this reply. May I know have you try to set up avatar integration to kunena from your backend > easyblog > settings > layout > avatars > avatar integration,
http://screencast.com/t/obzf1Xjn8 ? If yes and the issue is persisting, kindly provide us with your Joomla backend and FTP access and start a new thread in order to avoid confusion between our staff here.